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46 terms

ch. 16 lymphatic system

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lymphatic system
a widespread system of tissues and vessels, organs are not in order spread out all over the body
function of the lymphatic system
fluid balance, protection from infection, absorption of fats
lymph pathways
start out as lymph capillaries, they join to form larger vessels, and eventually dump into veins in the thorax
lymph capillaries
closed ended tubes that reach into the tissues between cells, draws fluid in ( osmosis)
simple squamous epithelium
walls of the lymph capillaries
lacteals
located in the small intestine, absorb lipids
lymph vessels
formed by merging lymph capillaries
walls of lymph vessels
similar to veins, have valves
lymph vessels
travel along superficial veins to lymphatic trunk
lymphatic trunk
drains a fairly large area of your body
lymphatic trunk
join 1 of 2 collecting ducts, along a trunk are lymph nodes
right lymphatic duct
empties into the right subclavian vein
thoracic duct or L. lymphatic duct
has more vessels and empties into the left subclavian vein
lymph
excess tissue fluid, contains dissolved substances
where does lymph come from?
blood plasma, fluid leaks out of the capillaries
what is the function of the lymph?
carries various foreign particles such as bacteria and viruses to the lymph nodes
movement of lymph
under low pressure so it moves by skeletal muscle contraction, breathing, valves
what happens if an obstruction occurs?
fluid tissue will accummulate
lymph nodes
found along the lymph pathways, contain a large number of lymphocytes
afferent lymph vessels
bring lymph into the node at several dif. spots
efferent lymph vessels
carry lymph out of the node at the hilum
lymph nodes
usually found in groups or chains, but not in the central nervous system, some are superficial and some are deep
cervical nodes
located in the neck in deep and superficial areas, often become enlarged during respiratory infections
inguinal nodes
located in the groin area, recieve lymph from lower extremities and external genital areas
axillary nodes
located in the armpits, cancer cells from breast often metastasize here
mesenteric nodes
deep, found between the two layers of peritoneum that form the mesentery
all nodes
contain lymphocytes, macrophanges, which destroy foreign substances
thymus gland
located in the mediastinum, between the lungs, above the heart
thymus gland
larger in infancy and early childhood, decreases in size after puberty
T lymphocytes
some cells after they mature in the thymus, leave the gland to function against specific pathogens
thymosine
produced in the thymus gland, tells the T lymphocytes to mature
spleen
filled with blood, reservoir, also contains lymphocytes and macrophanges
tonsils
lymph nodes that trap bacteria
pharyngeal
lie behind the nose (adenoids)
palatine tonsils
oval bodies located at each side of the soft palate, back of the throat
lingual tonsils
little mounds of lymphoid tissue located at the posterior of the tongue
bodies lines of defense
intact skin and mucous membranes, inflamation, immunity
harps
heat, ache, red, pus, swollen (inflamation)
immunity
specific, systemic
natural immunity
can be active or passive
active natural immunity
contact with the disease, you make the immune response in the body
passive natural immunity
placenta, gives antibodies to the body, mothers milk
artificial immunity
active and passive also
active artificial immunity
vaccine, artificially inquired, makes your body build up antibodies against the vaccine
passive artificial immunity
immune serum or immunoglobulin, takes care of it right away, your body doesn't have to build up antibodies, short term, it's passive because you get the antibodies from someone else
lymphatic system
helps your body remember